Because robot looks better for idiots who rule this shit - "managers".

net paste probably but true like hell:

Toothpaste factory, big problems. Customers and pickers have reported that some of the tubes are simply empty inside. Knowing that the company's reputation was at stake, the boss called a board meeting to establish an action plan Everyone agreed: the problem of empty tubes can only be done by specialized external engineers. The project went through all stages: the budget was set, the executive position was selected and an inquiry was sent. Six months (and PLN 7 million $) later companies, a fantastic solution - on time, within the loan and, above all, high quality. Everybody was happy. A very precise scale was used that weighed each tube and signalled with a bell and flashing lights if any were lighter than needed. As it went on, the production line stopped, someone came over, removed the empty tube, pressed one button, and the line continued. The result was that no more empty tubes came out of the factories. The lack of complaints from customers confirmed the boss's belief that the expenditure of 7 million $ has paid off. After starting in the renewal report, he found that in the first number of tubes rejected by the scale coincided with the predictions, early for the next three weeks the scale did not detect any! Meanwhile, the estimated number of empty tubes predicted shall be at least a dozen per day. At the command of the boss, the engineers checked the equipment and confirmed that the report did not contain any errors, the balance was working flawlessly. Surprised by such a turn, he went to the factory check with his own eyes the productions and installed on his scales. When he got there, he saw that the exit for the solution for 7 millions was a basket and a household fan worth some 15$, which was blowing empty tubes into it. So he asked the shift manager what it was all about.

• Oh this ? - replied the manager - Bart, a young man from the service, put it because he did not want to wander here every time the bell rang.

But usually nobody ever ask the staff doing actual shit what shall be corrected.